Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b49d261fc85a3a1542f2c0385944a4e3b660973bbddc861d0caa9a4f6894cf0c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16